6533b827fe1ef96bd12867e4
RESEARCH PRODUCT
A continuous reaction system to investigate dispersion polymerization of vinyl monomers in supercritical carbon dioxide
Onofrio ScialdoneAlberto GiaconiaAlessandro GaliaGiuseppe Filardosubject
chemistry.chemical_classificationDispersion polymerizationSupercritical carbon dioxidePolymers and PlasticsBulk polymerizationOrganic ChemistryRadical polymerizationmacromonomerPolymerSettore ING-IND/27 - Chimica Industriale E TecnologicaMacromonomerradical polymerizationkinetics (polym.)chemistry.chemical_compoundMonomerchemistryPolymerizationChemical engineeringpolysiloxanesupercritical carbon dioxidePolymer chemistryMaterials Chemistrydispersiondescription
A laboratory-scale continuous reaction system using a stirred tank reac- tor was assembled in our laboratory to study the dispersion polymerization of vinyl monomers in supercritical carbon dioxide (scCO2). The apparatus was equipped with a suitable downstream separation section to collect solid particles entrained in the effluent stream from the reactor, whose monomer concentration could be measured online with a gas chromatograph. The dispersion polymerization of methyl methacry- late in scCO2 was selected as a model process to be investigated in the apparatus. The experiments were performed at 65 8C and 25 MPa with 2,2 0 -azobisisobutyroni- trile as the initiator and a reactive polysiloxane macromonomer as a surfactant to investigate the effect of the mean residence time of the reaction mixture on the mono- mer conversion, polymerization rate, polymer molecular weight, and particle size dis- tribution. The results were compared with those obtained in batch polymerizations carried out under similar operative conditions. V C 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 4122-4135, 2006
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-01-01 |